lingzi luandkrystlecampbellandthe m.i.t. police officer shot down, sean collier. yes the city has the jubilation and also the tragedy and some of the victim's families responded to the arrest, john, the brother of krystle campbell telling "the boston globe" he's glad this arrest happen and it doesn't bring his sister back and the sentiment echoed by the richard family saying none of this will bring back our beloved martin so you still have a long, long way to go here. >> nothing will bring back their children, their brothers, their sisters. poppy harlow in watertown, thank you so much. >> the richard family still has the recovery of their daughter and the mother. so this is just still just the beginning for the families. spokesman for russian president vladimir putin says russia wants to get official information on the boston bombing suspects from the united states and expects there to be contact between investigators of both countries. >> how likely is this? let's ask barbara starr joining us now. what do we know about this russian/u.s. connection? >> well, john, christine, good

murmurs ] hey! ♪ [ howls ] ♪ >>> remembering the victims of the violence here inboston.krystlecampbell, martinrichard, lingzi lu all three killed at the finish line of the boston marathon and officer sean collier shot and killed thursday night while police searched for the suspects. >>> and police officers and firefighters from all around the boston area saluted officer collier as a hearse drove his body to a funeral home yesterday. police say it's not clear why one of the suspects shot and killed him. but collier had been responding to a loud disturbance at the time. the 26-year-old had been a police officer for just over a year. >> and new details are trickling in this morning about the bombing suspects and possible ties to islamic extremism. cnn foreign affairs correspondent jill dougherty at the white house this morning. jill, you are also moscow bureau chief for nine years. you are very familiar with russia. what more do we know about the investigation into the older brother's behavior? >> okay. so that would have been the older brother of course is tamerlan tsarnaev. and we have